Unloading mechanism



J an. 2, 1923. 1,441,023.

J. F. POLAND ET AL.

UNLOADING MECHANISM. FILED MAR. 17, m9.

7:765. 3y D-CQ7/ Patented Jan. 2, i592}.

JOHN F. POLAND, OE. EAST CLEVELAND, AND RICHARD IE.

OHIO.

it sit do IVIILLER, OF BAY VILLAGE,

UNLOADIN'G MECHANiSM.

Application filed March 17, 1919. Serial No. 283,029.

Thepresent invention, relating, as indicated, to unloading mechanism 18 more particularly directed to an improved grab bucket and means for operating the same for use in connection with an bridge for loading and unloading terials. A further object oi the invention is the provision in such a system of a siniple mechanism involving but four lines across the bridge, capable of racking the bucket in either direction across the bridge, and ofpositively opening and closing the bucket itself. The present improvements are further designed to be used in connection with an existing bridge and operating mechanism for providing a better and more positive controlfor the operation of the bucket and a control involving but two lines but affording positive actuation of the bucket at all times.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully de scribed and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mecl anisni embodying the invention. such disclosed means constituting, however. but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawinga Fig. 1 is a side elevation oi our improved bucket; Fig. 2 is a similar view of the other side of a modification of the bucket; Figs. 3 and it are plan views of the sheaves for controlling the buckets of F igs. 1 and 2, respectively; and 5 is a view of another modification of our bucket.

Reference will first be made to the bucket, as a clear understanding of the bucket is bulk inaoverhead desirable before the explanation of the operating system thereior is made. lVith reference then to Figs. 1 and 2 we have provided a grab bucket having two co-operative jaws 1, which are pivoted together about an axis 2 disposed above the bucket jaws proper, while the outer ends of the two jaws are connected. by means of arms 3 to a bucket head at, where these arms are pivotally mounted about an axis or shalt 5. In the form of bucket shown in Fig. 1 there is a sheave 6 rotatably mounted upon the axis of the shaft 2 and a second sheave '7 rotatably mounted in the bucket head -il,

and attached. to-the shaft which forms the dead-ended at the point 13, this line 12 extending downwardly around. the sheave 6 and being dead ended on the bucket head at the point 14-. The line 12 serves as the bucket operating line, directly effecting the opening and closing of the bucket.

In the bucket shown in Fig. 2 the construction is the same as that previously described, except that here an operating; sheave 15 is mounted above a bucket head 16, the

latter being supported from a frame holding the sheave 15, by means of cables 17. Except for this separation of the operating sheave cables from the bucket head the con struction of the bucket of Fin. 9 is identical with that oi F and operation of the vaious lines identical, as is indicated by the use responding numerals for the lines show Fig. 2 on the bucket head 16. tl 1e are iso 12, while a second cable 71 also attached to this sheave and carried about the upper sheave 15.

The operation of the bucket is entirely controlled by operation of the two lines 8 and 9, which extend about the sheave 7. The line 8 is the opening line and the line 9 is the closing line. If the cable 8 is wound l and the mounting counter-clockwise direction and winding in the cable 12. This draws up the bucket jaws to their closed position, shown in full lines in Figs. 1 and 2., To lift the bucket the.

lines 8 and 9 are drawn in simultaneously, or, if desired, a slightly greater tension may be'put on the line 9 than on the line 8, thus insuring that the bucket jaws remain in their closed position, although this will not ordinarily be necessary. By means of the two lines 8 and 9 and our improved bucket construction it is possible to lift or lower and to open or close the bucket positively by the operation of the two lines 8 and 9, which is a very great advantage in the handling of the bucket for many uses. v

Our improved bucket possesses one very great operating advantage over the standard two line bucket in which a closing line is slacked away to allow the bucketjaws to open. In such a bucket the closing line mustextend from the bucket to the bridge, across the. bridge and to the engine. It the bucket is at any great distance from the engine when opened it has to exert a great force to pull the sag out ofthe line extending over the bridge and consequently great trouble has been found under such condi- This' increases the distance between raaroee trol. lines 8 and 9, but these; are never operated. merely by the buckets weight, as one or the other is always positively wound in to operate the sheave 7. p

5 isa further modification of the bucket design, in which two controlling lines .8, and?) operate, as before, a sheave 7. In this form the cable 12 is omitted and there is substituted. therefor two connecting links 7 O and 71, of which the former is connected to the axis 2 of the spades of the bucket, while the link 71 is connected to, and operated by, the sheave 7. In such. a bucket both the opening and closing of the bucket are positively secured by the rotatiogli of the sheave 7 through the lines 8 an 9.

Other modes of applying the principle of our invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, pro vided the means stated by the following claim orthe equivalent of such stated means be employed.

We therefore particularly pointout and distinctly claim as our invention In a grab bucket. the combination of two pivotally connected jaws, a bucket head, arms connecting said head and the free ends of said j aws, a sheave mounted in said head,

two cables extending about said sheave in opposite directions and attached thereto,;

and a bucket closing cable attached to said sheave and controlling opening and closing of said bucket, said. first named two cables effecting rotation of said sheave to control said closing line. Signed .by us, this 15thday of March. 1919. Y

- JOHN F. POLAND.

, RICHARD E. MILLER. 

